The Act of a man laying behind a woman in bed while trying to fall asleep when suddenly the man pulls out his erect penis and flops it at the lower back of a woman in an attempt to arouse her sexually and if the clothing (or lack there of) is right he may even be able to flop it right into her vagina.
Dave: So I was layin' down with Felecia last night and I totally gave her the flop shot!
Steve: Nice!
Steve: Nice!
by Grand Prix Douche June 10, 2010
Get the Flop Shot mug.